Two thousand years ago, an unstoppable empire met an immovable people. Rome’s mighty legions had conquered most of Celtic Britain . . . except for the tribes of the far north. We have little direct evidence for Pictish culture, but there are strong suggestions that long before Christianity reached Scotland, the early Picts were using Neolithic sites built with mathematical precision — not just to honour their gods, but to track the stars and planets across the heavens. And what they left behind is more than just stone — it’s a prehistoric observatory that still works to this day.The Picts course is course on the website: https://celticsource.online/courses/the-picts/To receive a series of videos from the Celtic Source archive, please sign up to the mailing list: https://celticsource.online/mailing-list/David Nance's original paper: https://aura.abdn.ac.uk/bitstream/handle/2164/18401/Nance_SGJ_Investigation_Aberdeenshire_Ritual_VOR.pdf?sequence=1